显微荧光测量系统研制及TDSB有机单晶纳米线发光性质研究

发布时间：2018-03-27 16:28

本文选题：显微光谱测量系统　切入点：TDSB纳米线　出处：《河北大学》2017年硕士论文

【摘要】：本论文工作搭建了一套显微荧光光谱测量系统,将几种测量采集功能巧妙地融合在一套实验系统中,以TDSB有机单晶纳米线为研究对象,利用该系统并结合稳态荧光光谱技术和时间分辨光谱技术对纳米线的稳态荧光谱和荧光动力学进行了测量,并分析TDSB纳米线的荧光发射特性。本文主要内容如下:搭建了显微荧光光谱测量系统,该光谱测量系统的结构由飞秒激光器、光学多通道分析仪、时间相关单光子计数器与显微光路构成。该光谱测量系统实现了三大基本功能:(1)微观样品图像采集功能可实现720倍的放大成像;(2)稳态荧光光谱的采集功能可实现400~1000nm范围的荧光采集;(3)瞬态荧光动力学信号采集功能最小时间分辨可至50ps量级;同时该系统在光谱采集过程中还具备较高的空间分辨能力其视场空间分辨最大可至整个TV视野,最小不超过直径20um的圆周范围。分别利用稳态荧光光谱技术、时间分辨光谱技术对TDSB单晶纳米线被DCM掺杂前后的荧光发光特性进行研究。首先,采集了TDSB单晶纳米线被DCM掺杂前后的稳态荧光发射谱。结果表明,纳米线的荧光发射峰从晶体到掺杂体中有所变化,TDSB的荧光特征峰位发生红移,而且在由单晶体到掺有DCM浓度依次为5%、10%、15%的变化过程中,DCM的荧光峰位强度相对于TDSB荧光峰位强度逐步升高,这可能与纳米线中主客体之间的能量传递有关。其次,采集了TDSB单晶纳米线进行DCM掺杂前后的荧光动力学信号。发现TDSB的特征波长处荧光寿命在单晶体中最大,随着DCM掺杂浓度的升高,其荧光寿命呈现递减趋势,而DCM的荧光寿命则随掺杂浓度的升高而呈增加趋势,此结果表明纳米线中存在着主客体间能量传递,并对能量转移效率进行了估算。最后,对掺杂体纳米线的荧光传播损耗性质进行了研究。结果表明,纳米线不同波长的荧光传播损耗系数有所不同,且随波长增加而呈递减趋势;波长固定时荧光传播损耗系数随着掺杂浓度的升高而增加。
[Abstract]:In this paper, a set of micro-fluorescence spectrum measurement system is set up, and several measuring and collecting functions are skillfully fused into a set of experimental system. The TDSB organic single crystal nanowires are taken as the research object. The steady-state fluorescence spectrum and fluorescence kinetics of nanowires were measured by using the system, combined with steady-state fluorescence spectroscopy and time-resolved spectroscopy. The fluorescence emission characteristics of TDSB nanowires are analyzed. The main contents of this paper are as follows: a microscopic fluorescence spectrum measurement system is built. The structure of the system is composed of femtosecond laser, optical multichannel analyzer, and so on. The time dependent single photon counter and the microscopic optical circuit are constructed. The system realizes three basic functions: 1: 1) the image acquisition function of microscopic sample can realize 720 times magnification imaging and 2) the acquisition function of steady state fluorescence spectrum can be realized. The time resolution of transient fluorescence dynamic signal acquisition in 400~1000nm range is as low as 50ps. At the same time, the system also has high spatial resolution ability in the process of spectrum acquisition. The maximum spatial resolution of the field of view can reach the whole TV field of vision, and the minimum is not more than the circumferential range of the diameter 20um. The steady-state fluorescence spectrum technique is used, respectively. The fluorescence emission characteristics of TDSB single crystal nanowires before and after DCM doping were studied by time-resolved spectroscopy. Firstly, the steady-state fluorescence emission spectra of TDSB single crystal nanowires before and after DCM doping were collected. The fluorescence emission peak of nanowires changed from crystal to dopant, and the fluorescence characteristic peak of TDSB shifted red. Moreover, the fluorescence peak intensity of DCM gradually increased relative to that of TDSB, which may be related to the energy transfer between host and guest in nanowires. The fluorescence kinetic signals of TDSB single crystal nanowires before and after DCM doping were collected. It was found that the fluorescence lifetime at the characteristic wavelength of TDSB was the largest in single crystal, and the fluorescence lifetime decreased with the increase of DCM doping concentration. However, the fluorescence lifetime of DCM increases with the increase of doping concentration. The results show that there is energy transfer between host and guest in nanowires, and the energy transfer efficiency is estimated. The properties of fluorescence propagation loss of doped nanowires are studied. The results show that the fluorescence propagation loss coefficients of nanowires vary with wavelength and decrease with the increase of wavelength. The fluorescence propagation loss coefficient increases with the increase of doping concentration when the wavelength is fixed.
【学位授予单位】：河北大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TH744.1;TB383.1

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